Supporting apparatus for portable electronic device

A supporting apparatus for an electronic device, comprising:

• a first bracket comprising an end wall, and two opposite sidewalls extending from opposite ends of the end wall, wherein a channel is defined in an inner side of the first bracket and extends through the end wall and the sidewalls;
• a second bracket comprising an end plate, and two opposite side plates extending from opposite ends of the end plate;
• two connection mechanisms respectively and rotatably connecting the two opposite side plates to two ends of the two sidewalls;
• each of the two connection mechanism comprising a first gear mounted to one of the side plates of the second bracket, and a second gear pivotably mounted to a first side of a corresponding one of the ends of the sidewalls and meshing with the first gear;
• and
• two positioning mechanisms respectively mounted to the two sidewalls and connected with the two connection mechanisms;
• each of the two positioning mechanisms comprising a positioning member slidably attached to a second side of a corresponding one of the ends of the sidewalls, a resilient member arranged between the positioning member and the corresponding sidewall along an extending direction of the sidewall, and a positioning gear pivotably attached to the second side of the end of the sidewall and linked with the second gear, the positioning member comprising a positioning pole;
• wherein when the second bracket is rotated relative to the first bracket, each first gear drives the corresponding second gear to rotate, the corresponding positioning gear rotates with the second gear, when the positioning gear rotates to a first position where one of gear teeth of the positioning gear aligns with the positioning pole, the gear tooth pushes the positioning member to move away from the positioning gear with deforming the corresponding resilient member, when the positioning gear rotates to a second position where a dent between two adjacent gear teeth of the positioning gear aligns with the positioning pole, the resilient member biases the positioning member to move back toward the positioning gear, such that the positioning pole is positioned between the teeth to position the second bracket.